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314            MORPHOLOGY AND EVOLUTION
2.  Gastric plexus (G.P.).
3.   Splenic plexus (S.P.).
4.  Hepatic plexus (H.P.).
5.  Eenal plexuses (L.R.P. and R.K.P.).
6.  Left suprarenal plexus (L.S.BJ?.).
7.   Superior mesenteric plexus (S.M.P.).
8.  Communication to inferior mesenteric plexus.
9.  Phrenic plexus.
In the Gorilla the plexus is annular. Its offshoots, which are similar to those in the Chimpanzee, have more ganglia. In both the small splanchnic nerves run to the renal plexuses.
In the Orang" the right vagus only communicates with the plexus and ends in branches which accompany the branches of the superior mesenteric artery to the small and large intestines. Prom this arrangement one may conclude that the fibres which run from the coeliac plexus to the large intestine via the superior mesenteric plexus are vagus fibres.
Section E.—THE SENSE ORGANS. A.—THE ORGANS OF Torcn.
Tactile corpuscles are present under the papillary ridges in the skin of the Apes and Man, but the functions are most highly developed in Man. The human hand has lost its power of supporting the body and it has become highly specialized as a tactile organ. The foot is also an important sense organ, for its nerve endings give information of his position on the ground; and Man's two feet have to do the work of the four feet of *the Apes in this connection. When these stimuli are
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